Vernier-calipers.



H. HAUSER. VERNIER GALIPERS. APPLICATION FILED JAN. 28, 1910.

Patented Aug. 29, 1911.

flaw, 4 5% W SES VERNIER-CALIPERS.

Specification of Letters Patent.

Patented Aug. 29, 1911.

Application filed January 28, 1910. Serial No. 540,595.

To all whom it may concern:

Madretsch, near Biel, Switzerland, have invented certain new and usefulImprovements in and Relating to Vernier-Calipers, of which thefollowingis a specification.

This invention relates to calipers and more especially to Verniercalipers, the object being to provide a caliper of this kind which willprovide for measuring commodiously, exactly and simultaneously bothouter surfaces of a dove-tailed sliding member and of both innersurfaces associated with this sliding member.

The accompanying drawing, given by way of example shows one form ofembodiment of this invention and in this drawing:

Figure l is a side elevation view of the vernier caliper of which Fig. 2is a top plan new.

The metal rod A provided with the scales P and R, carries on itsopposite edges, the branches C and B, respectively. The edge E of theformer and the edge D of the latter form a determined angle (in thepresent case an angle of 40) with the metal rod A. The latter ispreferably of a flat, rectilinear and elongated formation, the broaderfiat surface of which is most prominent in Fig. 1, and

one of its lateral surfaces, which will hereinafter be called edges,being most prominent in Fig. 2. One edge of the rod A has a relativelywide portion A which carries the branch C and has a shoulder A adjacentto the base of said branch. This widened portion has an edge portion Awhich is parallel with the other longitudinal edges of the rod. This rodcarries a sliding member F adapted to be moved thereon to and fro. Thissliding member carries on its opposite lateral edges the branches H andG, respectively. The edge which carries the branch H is in alinementwith the edge A. The edge K of the former and the edge J of the latterform the same angle with the metal rod A (in the present instance 40) asthe branches B and C but in a direction which is opposite to that of thelatter. By tightening a screw L provided with a head and engaging acorrespondingly tapped hole in the sliding member F, one may prevent thelatter from being moved on the metal rod A. The scale P of the rod A isintended to allow the reading of the outer measure of a dovetailed tenonM which is embraced by the branches B and G and conforms to the edges Beit known that I, HENRI HAUSER, a citlzen of the Swiss Republic, andresident of D and J. This scale P also provides for reading the innermeasure of a dove-tailed guide N which conforms to the edges E and K ofsaid branches C and H. If it is desired that the tenon shall fit snuglywithin the said guide one adjustment of the gage is sufficient formeasuring both the tenon and the guide therefor. In all the adjustmentsof the members A and F, the outside measurements of the members E and Kwill be the same as the inside measurements of the members B and G.

The scale R of the rod A is designed for use in wooden patterns,allowance being made for shrinkage of the metal of the casting, as incooling. The measurements are read on that line of the scales P and Ropposite the zero point of the scales 0 and Q of the movable member. Inorder to allow of the exact reading of fractions of the in tervalsbetween the divisions of the scales P and R, when it occurs that thezero lines do not exactly register with the device of said scale, use ismade of the verniers P and R of the usual type.

I claim:

1. In a vernier caliper a rod having parallel surfaces and edges, saidrod being provided with a scale, one end of said rod being wider thanthe other end, and an angularly disposed branch on the relatively wideportion, and a shoulder adjacent to the base of the branch, and anoppositely disposed branch on the opposite edge of the enlarged portionand longer than the first mentioned branch, a slidable member on saidrod adapted to abut against said shoulder, adjacent to the base of thefirst mentioned branch, the said slidable member being provided with ascale thereon, and adapted to register with the first mentioned scaleand having an edge in alinement with one edge of the rod and carrying abranch on said edge, said branch extending in the opposite directionfrom the first mentioned branch, and an oppositely disposed branch onthe opposite edge of the slidable member, said branch being longer thanthe third mentioned branch.

2. In a Vernier caliper, an elongated rod having flat surfaces andedges, a relatively wide portion provided on one end of said rod, abranch adjacent to and forming an angle with one edge of said relativelywide portion, said branch having a shoulder adjacent to the base of thebranch, a second branch adjacent to and forming an angle With theopposite edge of said relatively Wide portion, a slidable member on saidrod adapted to abut against said shoulder, a branch adjacent to andforming an angle with each of the opposite edges, the branches on oneside of said calipers adapted to measure the outer surfaces of thedove-tail male member at the same time the branches on the other sidemeasure the inner surfaces of the dove-tail female member, a scale onthe rod and a scale on the slidable member.

In testimony whereof I have hereunto set my hand in presence oftwowitnesses.

HENRI HAUSER.

WVitnesses FRIEDRICH Scnwoonn,

CHRISTIAN SOMMER;

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

